chore(deps): update dependency posthog-js to v1.256.2

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

bun.lock

@@ -39,7 +39,7 @@
     "gray-matter": "4.0.3",
     "lucide-react": "0.525.0",
     "next": "15.3.4",
-    "posthog-js": "1.256.0",
+    "posthog-js": "1.256.2",
     "posthog-node": "5.1.1",
     "prettier": "3.6.2",
     "react": "19.1.0",